The term "Catherine I" refers to a specific historical figure, rather than a common English word. Here’s an easy explanation:
Catherine I was the Empress of Russia. She became the ruler after her husband, Peter the Great, who was a well-known and powerful leader. Catherine I was born in 1684 and died in 1727. She was important because she helped continue the work of her husband in modernizing Russia and making it a stronger country.
In more advanced discussions, you might talk about Catherine I's influence on Russian politics or her contributions to the Russian court.
Catherine I does not have different meanings in English; it specifically refers to the historical figure.
There are no synonyms for Catherine I as it is a proper name. You might refer to her as Empress of Russia in broader discussions.
Since Catherine I is a historical name, there are no idioms or phrasal verbs associated with it.